.prograss_bar {
  position: relative;
  overflow: hidden;
}
.prograss_bar::before {
  content: '';
  position: absolute;
  z-index: -1;
  top: 0px;
  left: 0px;

  border-radius: inherit;

  width: calc(var(--current_num) / var(--total_num) * 100%);

  height: 100%;

  background-color: #09b00bbd;

  transition: width 0.2s;
}
